If you are thinking or better said overthinking on the subject of which one to choose for less water retention then short answer is:do not waste time just buy the one you get best deal on or the one which is available.

Yeah the Enanthate has a 7-carbon ester chain while cypionate has an 8-carbon ester chain and as we know....read full article here.

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The link is not working but to comment on subject of water retention between testosterone cypionate vs testosterone enanthate there is no much difference.